Transmit power control method and device in D2D communication

Abstract

In the present invention, a network device determines and delivers control information, where the control information includes first subframe information and a first power control manner in which power control is performed in a first subframe corresponding to the first subframe information, and second subframe information and a second power control manner in which power control is performed in a second subframe corresponding to the second subframe information. A user equipment in D2D communication acquires the control information delivered by the network device; transmits, by using the transmit power determined according to the first power control manner, a D2D signal in the first subframe corresponding to the first subframe information; and transmits, by using the transmit power determined according to the second power control manner, a D2D signal in the second subframe corresponding to the second subframe information.

The invention claimed is: 
     
       1. A transmit power control method in device to device (D2D) communication, the method comprising:
 determining control information, wherein the control information comprises:
 first subframe information and first power control parameters for performing power control in a first subframe corresponding to the first subframe information, and 
 second subframe information and second power control parameters for performing power control in a second subframe corresponding to the second subframe information; and 
 
 delivering the control information to a user equipment for enabling the user equipment in D2D communication to transmit, by using transmit power determined according to the first power control parameters, a D2D signal in the first subframe corresponding to the first subframe information, and transmit, by using transmit power determined according to the second power control parameters, a D2D signal in the second subframe corresponding to the second subframe information; 
 wherein the first power control parameters comprise a first path loss compensation factor and first target receive power that is delivered by a network device and at which the network device receives an uplink signal; 
 wherein the second power control parameters comprise a second path loss compensation factor and a second target receive power that is delivered by the network device and at which the network device receives an uplink signal; and 
 wherein the first target receive power comprised in the first power control parameters is different from the second target receive power comprised in the second power control parameters. 
 
     
     
       2. The method according to  claim 1 , wherein:
 delivering the control information to the user equipment for enabling the user equipment in D2D communication to transmit, by using transmit power determined according to the first power control parameters, the D2D signal in the first subframe corresponding to the first subframe information, and transmit, by using transmit power determined according to the second power control parameters, the D2D signal in the second subframe corresponding to the second subframe information comprises:
 delivering the first subframe information, the first power control parameters, the second subframe information, and the second power control parameters to the user equipment, the subframe information and power control parameters for enabling the user equipment in D2D communication to transmit, by using the transmit power determined according to the first power control parameters, the D2D signal in the first subframe corresponding to the first subframe information, and transmit, by using the transmit power determined according to the second power control parameters, the D2D signal in the second subframe corresponding to the second subframe information. 
 
 
     
     
       3. The method according to  claim 2 , wherein the first power control parameters further comprise a first power offset and the second power control parameters further comprise a second power offset. 
     
     
       4. The method according to  claim 1 , wherein:
 the second power control parameters comprise instruction information for instructing the user equipment to transmit the D2D signal in the second subframe by using maximum transmit power supported by the user equipment in D2D communication; and 
 delivering the control information, to the user equipment for enabling the user equipment in D2D communication to transmit, by using transmit power determined according to the first power control parameters, the D2D signal in the first subframe corresponding to the first subframe information, and transmit, by using transmit power determined according to the second power control parameters, the D2D signal in the second subframe corresponding to the second subframe information comprises:
 delivering the first subframe information, the first power control parameters, the second subframe information, and the instruction information, the information and power control parameters for enabling the user equipment in D2D communication to transmit, by using the transmit power determined according to the first power control parameters, the D2D signal in the first subframe corresponding to the first subframe information, and transmit, by using the maximum transmit power supported by the user equipment in D2D communication, the D2D signal in the second subframe corresponding to the second subframe information. 
 
 
     
     
       5. A transmit power control method in device to device (D2D) communication, the method comprising:
 acquiring control information delivered by a network device, wherein the control information comprises:
 first subframe information and first power control parameters for performing power control in a first subframe corresponding to the first subframe information, and 
 second subframe information and second power control parameters for performing power control in a second subframe corresponding to the second subframe information; and 
 
 transmitting, according to the control information by using transmit power determined according to the first power control parameters, a D2D signal in the first subframe corresponding to the first subframe information, and transmitting, according to the control information by using transmit power determined according to the second power control parameters, a D2D signal in the second subframe corresponding to the second subframe information; 
 wherein the first power control parameters comprise a first path loss compensation factor and a first target receive power that is delivered by the network device and at which a network device receives an uplink signal; 
 wherein the second power control parameters comprise a second path loss compensation factor and a second target receive power that is delivered by the network device and at which the network device receives an uplink signal; and 
 wherein the first target receive power comprised in the first power control parameters is different from the second target receive power comprised in the second power control parameters. 
 
     
     
       6. The method according to  claim 5 , wherein:
 transmitting, according to the control information by using transmit power determined according to the first power control parameters, the D2D signal in the first subframe corresponding to the first subframe information, and transmitting, according to the control information by using transmit power determined according to the second power control parameters, the D2D signal in the second subframe corresponding to the second subframe information comprises:
 transmitting, according to the first subframe information and the first power control parameters by using the transmit power determined according to the first power control parameters, the D2D signal in the first subframe corresponding to the first subframe information, and 
 transmitting, according to the second subframe information and the second power control parameters by using the transmit power determined according to the second power control parameters, the D2D signal in the second subframe corresponding to the second subframe information. 
 
 
     
     
       7. The method according to  claim 6 , wherein the first power control parameters further comprise a first power offset and the second power control parameters further comprise a second power offset. 
     
     
       8. The method according to  claim 5 , wherein:
 the second power control parameters comprise instruction information for transmitting the D2D signal in the second subframe corresponding to the second subframe information by using maximum transmit power supported by a user equipment in D2D communication, where the first subframe information and the first power control parameters are delivered by the network device; and 
 transmitting, according to the control information by using transmit power determined according to the first power control parameters, the D2D signal in the first subframe corresponding to the first subframe information, and transmitting, according to the control information by using transmit power determined according to the second power control parameters, the D2D signal in the second subframe corresponding to the second subframe information comprises:
 transmitting, according to the first subframe information and the first power control parameters by using the transmit power determined according to the first power control parameters, the D2D signal in the first subframe corresponding to the first subframe information, and 
 transmitting, according to the second subframe information and the instruction information by using the maximum transmit power supported by the user equipment in D2D communication, the D2D signal in the second subframe corresponding to the second subframe information. 
 
 
     
     
       9. A network device, comprising:
 at least one processor configured to determine control information, wherein the control information comprises:
 first subframe information and first power control parameters for performing power control in a first subframe corresponding to the first subframe information, and 
 second subframe information and second power control parameters for performing power control in a second subframe corresponding to the second subframe information; and 
 
 a transmitter configured to deliver the control information to user equipment for enabling the user equipment in device to device (D2D) communication to transmit, by using transmit power determined according to the first power control parameters, a D2D signal in the first subframe corresponding to the first subframe information, and transmit, by using transmit power determined according to the second power control parameters, a D2D signal in the second subframe corresponding to the second subframe information, 
 wherein the first power control parameters comprise a first path loss compensation factor and a first target receive power that is delivered by the network device and at which a network device receives an uplink signal; 
 wherein the second power control parameters comprise a second path loss compensation factor and a second target receive power that is delivered by the network device and at which the network device receives an uplink signal; and 
 wherein the first target receive power comprised in the first power control parameters is different from the second target receive power comprised in the second power control parameters. 
 
     
     
       10. The network device according to  claim 9 , wherein:
 the transmitter is configured to deliver the control information in the following manner:
 deliver the first subframe information, the first power control parameters, the second subframe information, and the second power control parameters, the subframe information and power control parameters for enabling the user equipment in D2D communication to transmit, by using the transmit power determined according to the first power control parameters, the D2D signal in the first subframe corresponding to the first subframe information, and transmit, by using the transmit power determined according to the second power control parameters, the D2D signal in the second subframe corresponding to the second subframe information. 
 
 
     
     
       11. The network device according to  claim 10 , wherein the first power control parameters further comprise a first power offset and the second power control parameters further comprise a second power offset. 
     
     
       12. The network device according to  claim 9 , wherein:
 the second power control parameters comprise instruction information for instructing the user equipment to transmit the D2D signal in the second subframe by using maximum transmit power supported by the user equipment in D2D communication; and 
 the transmitter is configured to deliver the control information in the following manner:
 deliver the first subframe information, the first power control parameters, the second subframe information, and the instruction information, the information and power control parameters for enabling the user equipment in D2D communication to transmit, by using the transmit power determined according to the first power control parameters, the D2D signal in the first subframe corresponding to the first subframe information, and transmit, by using the maximum transmit power supported by the user equipment in D2D communication, the D2D signal in the second subframe corresponding to the second subframe information. 
 
 
     
     
       13. A user equipment, comprising:
 a receiver configured to acquire control information delivered by a network device, wherein the control information comprises:
 first subframe information and first power control parameters for performing power control in a first subframe corresponding to the first subframe information, and 
 second subframe information and second power control parameters for performing power control in a second subframe corresponding to the second subframe information; and 
 
 a transmitter configured to: according to the control information acquired by the receiver, transmit, by using transmit power determined according to the first power control parameters, a device to device (D2D) signal in the first subframe corresponding to the first subframe information, and transmit, by using transmit power determined according to the second power control parameters, a D2D signal in the second subframe corresponding to the second subframe information; 
 wherein the first power control parameters comprise a first path loss compensation factor and a first target receive power that is delivered by the network device and at which a network device receives an uplink signal; 
 wherein the second power control parameters comprise a second path loss compensation factor and a second target receive power that is delivered by the network device and at which the network device receives an uplink signal; and 
 wherein the first target receive power comprised in the first power control parameters is different from the second target receive power comprised in the second power control parameters. 
 
     
     
       14. The user equipment according to  claim 13 , wherein:
 the transmitter is further configured to:
 transmit, according to the first subframe information and the first power control parameters by using the transmit power determined according to the first power control parameters, the D2D signal in the first subframe corresponding to the first subframe information, and 
 transmit, according to the second subframe information and the second power control parameters by using the transmit power determined according to the second power control parameters, the D2D signal in the second subframe corresponding to the second subframe information. 
 
 
     
     
       15. The user equipment according to  claim 14 , wherein the first power control parameters further comprise a first power offset and the second power control parameters further comprise a second power offset. 
     
     
       16. The user equipment according to  claim 13 , wherein:
 the second power control parameters comprise instruction information for transmitting the D2D signal in the second subframe corresponding to the second subframe information by using maximum transmit power supported by the user equipment in D2D communication, where the first subframe information and the first power control parameters are delivered by the network device; and 
 the transmitter is further configured to:
 transmit, according to the first subframe information and the first power control parameters by using the transmit power determined according to the first power control parameters, the D2D signal in the first subframe corresponding to the first subframe information, and 
 transmit, according to the second subframe information and the instruction information by using the maximum transmit power supported by the user equipment in D2D communication, the D2D signal in the second subframe corresponding to the second subframe information.